diff --git a/include/bw_sampler.h b/include/bw_sampler.h
new file mode 100644
index 0000000..1ee184d
--- /dev/null
+++ b/include/bw_sampler.h
@@ -0,0 +1,793 @@
+/*
+ * Brickworks
+ *
+ * Copyright (C) 2025 Orastron Srl unipersonale
+ *
+ * Brickworks is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * Brickworks is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Brickworks. If not, see .
+ *
+ * File author: Stefano D'Angelo
+ */
+
+/*!
+ * module_type {{{ dsp }}}
+ * version {{{ 1.0.0 }}}
+ * requires {{{ bw_common }}}
+ * description {{{
+ * ...
+ * }}}
+ * changelog {{{
+ *
+ * - Version 1.0.0:
+ *
+ *
+ *
+ * }}}
+ */
+
+#ifndef BW_SAMPLER_H
+#define BW_SAMPLER_H
+
+#ifdef BW_INCLUDE_WITH_QUOTES
+# include "bw_common.h"
+#else
+# include
+#endif
+
+#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
+extern "C" {
+#endif
+
+/*** Public API ***/
+
+/*! api {{{
+ * #### bw_sampler_coeffs
+ * ```>>> */
+typedef struct bw_sampler_coeffs bw_sampler_coeffs;
+/*! <<<```
+ * Coefficients and related.
+ *
+ * #### bw_sampler_state
+ * ```>>> */
+typedef struct bw_sampler_state bw_sampler_state;
+/*! <<<```
+ * Internal state and related.
+ *
+ * #### bw_sampler_init()
+ * ```>>> */
+static inline void bw_sampler_init(
+ bw_sampler_coeffs * BW_RESTRICT coeffs);
+/*! <<<```
+ * Initializes input parameter values in `coeffs`.
+ *
+ * #### bw_sampler_set_sample_rate()
+ * ```>>> */
+static inline void bw_sampler_set_sample_rate(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ float sample_rate);
+/*! <<<```
+ * Sets the `sample_rate` (Hz) value in `coeffs`.
+ *
+ * #### bw_sampler_reset_coeffs()
+ * ```>>> */
+static inline void bw_sampler_reset_coeffs(
+ bw_sampler_coeffs * BW_RESTRICT coeffs);
+/*! <<<```
+ * Resets coefficients in `coeffs` to assume their target values.
+ *
+ * #### bw_sampler_reset_state()
+ * ```>>> */
+static inline float bw_sampler_reset_state(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length,
+ float pos_0);
+/*! <<<```
+ * ...
+ *
+ * #### bw_sampler_reset_state_multi()
+ * ```>>> */
+static inline void bw_sampler_reset_state_multi(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT const * BW_RESTRICT state,
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sample_length,
+ const float * pos_0,
+ float * y_0,
+ size_t n_channels);
+/*! <<<```
+ * ...
+ *
+ * #### bw_sampler_update_coeffs_ctrl()
+ * ```>>> */
+static inline void bw_sampler_update_coeffs_ctrl(
+ bw_sampler_coeffs * BW_RESTRICT coeffs);
+/*! <<<```
+ * Triggers control-rate update of coefficients in `coeffs`.
+ *
+ * #### bw_sampler_update_coeffs_audio()
+ * ```>>> */
+static inline void bw_sampler_update_coeffs_audio(
+ bw_sampler_coeffs * BW_RESTRICT coeffs);
+/*! <<<```
+ * Triggers audio-rate update of coefficients in `coeffs`.
+ *
+ * #### bw_sampler_process1()
+ * ```>>> */
+static inline float bw_sampler_process1(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length);
+/*! <<<```
+ * ...
+ *
+ * #### bw_sampler_process()
+ * ```>>> */
+static inline void bw_sampler_process(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length,
+ float * BW_RESTRICT y,
+ size_t n_samples);
+/*! <<<```
+ * ...
+ *
+ * #### bw_sampler_process_multi()
+ * ```>>> */
+static inline void bw_sampler_process_multi(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT const * BW_RESTRICT state,
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sample_length,
+ float * BW_RESTRICT const * BW_RESTRICT y,
+ size_t n_channels,
+ size_t n_samples);
+/*! <<<```
+ * ...
+ *
+ * #### bw_sampler_set_playback_rate()
+ * ```>>> */
+static inline void bw_sampler_set_playback_rate(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ float value);
+/*! <<<```
+ * Sets the ... `value` in `coeffs`.
+ *
+ * `value` must be finite.
+ *
+ * Default value: `1.f`.
+ *
+ * #### bw_sampler_coeffs_is_valid()
+ * ```>>> */
+static inline char bw_sampler_coeffs_is_valid(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs);
+/*! <<<```
+ * Tries to determine whether `coeffs` is valid and returns non-`0` if it
+ * seems to be the case and `0` if it is certainly not. False positives are
+ * possible, false negatives are not.
+ *
+ * `coeffs` must at least point to a readable memory block of size greater
+ * than or equal to that of `bw_sampler_coeffs`.
+ *
+ * #### bw_sampler_state_is_valid()
+ * ```>>> */
+static inline char bw_sampler_state_is_valid(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ const bw_sampler_state * BW_RESTRICT state);
+/*! <<<```
+ * Tries to determine whether `state` is valid and returns non-`0` if it
+ * seems to be the case and `0` if it is certainly not. False positives are
+ * possible, false negatives are not.
+ *
+ * If `coeffs` is not `BW_NULL` extra cross-checks might be performed
+ * (`state` is supposed to be associated to `coeffs`).
+ *
+ * `state` must at least point to a readable memory block of size greater
+ * than or equal to that of `bw_sampler_state`.
+ * }}} */
+
+#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
+}
+#endif
+
+/*** Implementation ***/
+
+/* WARNING: This part of the file is not part of the public API. Its content may
+ * change at any time in future versions. Please, do not use it directly. */
+
+#ifdef BW_INCLUDE_WITH_QUOTES
+# include "bw_math.h"
+# include "bw_one_pole.h"
+#else
+# include
+# include
+#endif
+
+#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
+extern "C" {
+#endif
+
+#ifdef BW_DEBUG_DEEP
+enum bw_sampler_coeffs_state {
+ bw_sampler_coeffs_state_invalid,
+ bw_sampler_coeffs_state_init,
+ bw_sampler_coeffs_state_set_sample_rate,
+ bw_sampler_coeffs_state_reset_coeffs
+};
+#endif
+
+struct bw_sampler_coeffs {
+#ifdef BW_DEBUG_DEEP
+ uint32_t hash;
+ enum bw_sampler_coeffs_state state;
+ uint32_t reset_id;
+#endif
+
+ // Parameters
+ float playback_rate;
+};
+
+struct bw_sampler_state {
+#ifdef BW_DEBUG_DEEP
+ uint32_t hash;
+ uint32_t coeffs_reset_id;
+#endif
+
+ // States
+ float pos;
+};
+
+static inline void bw_sampler_init(
+ bw_sampler_coeffs * BW_RESTRICT coeffs) {
+ BW_ASSERT(coeffs != BW_NULL);
+
+ coeffs->playback_rate = 1.f;
+
+#ifdef BW_DEBUG_DEEP
+ coeffs->hash = bw_hash_sdbm("bw_sampler_coeffs");
+ coeffs->state = bw_sampler_coeffs_state_init;
+ coeffs->reset_id = coeffs->hash + 1;
+#endif
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state == bw_sampler_coeffs_state_init);
+}
+
+static inline void bw_sampler_set_sample_rate(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ float sample_rate) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_init);
+ BW_ASSERT(bw_is_finite(sample_rate) && sample_rate > 0.f);
+
+ (void)coeffs;
+ (void)sample_rate;
+
+#ifdef BW_DEBUG_DEEP
+ coeffs->state = bw_sampler_coeffs_state_set_sample_rate;
+#endif
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state == bw_sampler_coeffs_state_set_sample_rate);
+}
+
+static inline void bw_sampler_reset_coeffs(
+ bw_sampler_coeffs * BW_RESTRICT coeffs) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_set_sample_rate);
+
+ (void)coeffs;
+
+#ifdef BW_DEBUG_DEEP
+ coeffs->state = bw_sampler_coeffs_state_reset_coeffs;
+ coeffs->reset_id++;
+#endif
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state == bw_sampler_coeffs_state_reset_coeffs);
+}
+
+static inline float bw_sampler_interpolate(
+ const float * BW_RESTRICT sample,
+ size_t sample_length,
+ float pos) {
+{
+ BW_ASSERT(sample_length > 0);
+
+ float xm1, x0, x1, x2, d;
+ if (pos >= 1.f) {
+ const size_t p = static_cast(pos);
+ if (p + 2 < sample_length) {
+ xm1 = sample[p - 1];
+ x0 = sample[p];
+ x1 = sample[p + 1];
+ x2 = sample[p + 2];
+ } else if (p + 2 == sample_length) {
+ xm1 = sample[p - 1];
+ x0 = sample[p];
+ x1 = sample[p + 1];
+ x2 = 0.f;
+ } else if (p + 1 == sample_length) {
+ xm1 = sample[p - 1];
+ x0 = sample[p];
+ x1 = 0.f;
+ x2 = 0.f;
+ } else if (p == sample_length) {
+ xm1 = sample[p - 1];
+ x0 = 0.f;
+ x1 = 0.f;
+ x2 = 0.f;
+ } else
+ return 0.f;
+ d = pos - p;
+ } else if (pos >= 0.f) {
+ xm1 = 0.f;
+ x0 = sample[0];
+ if (sample_length > 1) {
+ x1 = sample[1];
+ x2 = sample_length > 2 ? sample[2] : 0.f;
+ } else {
+ x1 = 0.f;
+ x2 = 0.f;
+ }
+ d = pos;
+ } else if (pos >= -1.f) {
+ xm1 = 0.f;
+ x0 = 0.f;
+ x1 = sample[0];
+ x2 = sample_length > 1 ? sample[1] : 0.f;
+ d = pos + 1.f;
+ } else if (pos >= -2.f) {
+ xm1 = 0.f;
+ x0 = 0.f;
+ x1 = 0.f;
+ x2 = sample[0];
+ d = pos + 2.f;
+ } else
+ return 0.f;
+
+ // 3rd degree B-spline
+ return (d * ((0.5f - 0.1666666666666667f * d) * d - 0.5f) + 0.1666666666666667f) * xm1
+ + ((0.5f * d - 1.f) * d * d + 0.6666666666666666f) * x0
+ + (d * ((0.5f - 0.5f * d) * d + 0.5f) + 0.1666666666666667f) * x1
+ + 0.1666666666666667f * d * d * d * x2;
+}
+
+static inline float bw_sampler_reset_state(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length,
+ float pos_0) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT(state != BW_NULL);
+ BW_ASSERT(sample != BW_NULL);
+ BW_ASSERT(sample_length > 0);
+ BW_ASSERT_DEEP(bw_has_only_finite(sample, sample_length));
+ BW_ASSERT(bw_is_finite(pos_0));
+ BW_ASSERT(pos_0 >= 0.f);
+
+ (void)coeffs;
+ state->pos = pos_0;
+ const float y = bw_sampler_interpolate(sample, sample_length, pos_0);
+
+#ifdef BW_DEBUG_DEEP
+ state->hash = bw_hash_sdbm("bw_sampler_state");
+ state->coeffs_reset_id = coeffs->reset_id;
+#endif
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state));
+ BW_ASSERT(bw_is_finite(y));
+
+ return y;
+}
+
+static inline void bw_sampler_reset_state_multi(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT const * BW_RESTRICT state,
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sample_length,
+ const float * pos_0,
+ float * y_0,
+ size_t n_channels) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT(state != BW_NULL);
+#ifndef BW_NO_DEBUG
+ for (size_t i = 0; i < n_channels; i++)
+ for (size_t j = i + 1; j < n_channels; j++)
+ BW_ASSERT(state[i] != state[j]);
+#endif
+ BW_ASSERT(sample != BW_NULL);
+ BW_ASSERT(sample_length != BW_NULL);
+ BW_ASSERT(pos_0 != BW_NULL);
+#ifndef BW_NO_DEBUG
+ for (size_t i = 0; i < n_channels; i++) {
+ BW_ASSERT(sample[i] != pos_0);
+ BW_ASSERT(sample[i] != y_0);
+ for (size_t j = i + 1; j < n_channels; j++)
+ BW_ASSERT(sample[i] != sample[j]);
+ }
+#endif
+
+ if (y_0 != BW_NULL)
+ for (size_t i = 0; i < n_channels; i++)
+ y_0[i] = bw_sampler_reset_state(coeffs, state[i], sample[i], sample_length[i], pos_0[i]);
+ else
+ for (size_t i = 0; i < n_channels; i++)
+ bw_sampler_reset_state(coeffs, state[i], sample[i], sample_length[i], pos_0[i]);
+
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT_DEEP(y_0 != BW_NULL ? bw_has_only_finite(y_0, n_channels) : 1);
+}
+
+static inline void bw_sampler_update_coeffs_ctrl(
+ bw_sampler_coeffs * BW_RESTRICT coeffs) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+
+ (void)coeffs;
+}
+
+static inline void bw_sampler_update_coeffs_audio(
+ bw_sampler_coeffs * BW_RESTRICT coeffs) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+
+ (void)coeffs;
+}
+
+static inline float bw_sampler_process1(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT(state != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state));
+ BW_ASSERT(sample != BW_NULL);
+ BW_ASSERT(sample_length > 0);
+ BW_ASSERT_DEEP(bw_has_only_finite(sample, sample_length));
+
+ float y;
+ if (state->pos >= sample_length + 2) {
+ y = bw_sampler_interpolate(sample, sample_length, state->pos);
+ state->pos += coeffs->playback_rate;
+ } else
+ y = 0.f;
+
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state));
+ BW_ASSERT(bw_is_finite(y));
+
+ return y;
+}
+
+static inline void bw_sampler_process(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT state,
+ const float * BW_RESTRICT sample,
+ size_t sample_length,
+ float * BW_RESTRICT y,
+ size_t n_samples) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT(state != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state));
+ BW_ASSERT(sample != BW_NULL);
+ BW_ASSERT(sample_length > 0);
+ BW_ASSERT_DEEP(bw_has_only_finite(sample, sample_length));
+ BW_ASSERT(y != BW_NULL);
+ BW_ASSERT(sample != y);
+
+ for (size_t i = 0; i < n_samples; i++)
+ y[i] = bw_sampler_process1(coeffs, state, sample, sample_length);
+
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state));
+ BW_ASSERT_DEEP(bw_has_only_finite(y, n_samples));
+}
+
+static inline void bw_sampler_process_multi(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ bw_sampler_state * BW_RESTRICT const * BW_RESTRICT state,
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sample_length,
+ float * BW_RESTRICT const * BW_RESTRICT y,
+ size_t n_channels,
+ size_t n_samples) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+ BW_ASSERT(state != BW_NULL);
+#ifndef BW_NO_DEBUG
+ for (size_t i = 0; i < n_channels; i++) {
+ BW_ASSERT(state[i] != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state[i]));
+ }
+ for (size_t i = 0; i < n_channels; i++)
+ for (size_t j = i + 1; j < n_channels; j++)
+ BW_ASSERT(state[i] != state[j]);
+#endif
+ BW_ASSERT(sample != BW_NULL);
+ BW_ASSERT(sample_length != BW_NULL);
+ BW_ASSERT(y != BW_NULL);
+#ifndef BW_NO_DEBUG
+ for (size_t i = 0; i < n_channels; i++) {
+ BW_ASSERT(sample[i] != BW_NULL);
+ BW_ASSERT(sample_length[i] > 0);
+ BW_ASSERT_DEEP(bw_has_only_finite(sample[i], sample_length[i]));
+ BW_ASSERT(y[i] != BW_NULL);
+ }
+ for (size_t i = 0; i < n_channels; i++)
+ for (size_t j = i + 1; j < n_channels; j++)
+ BW_ASSERT(y[i] != y[j]);
+ for (size_t i = 0; i < n_channels; i++)
+ for (size_t j = 0; j < n_channels; j++)
+ BW_ASSERT(sample[i] != y[j]);
+#endif
+
+ for (size_t j = 0; j < n_channels; j++)
+ for (size_t i = 0; i < n_samples; i++)
+ y[j][i] = bw_sampler_process1(coeffs, state[j], sample[j], sample_length[j]);
+
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_reset_coeffs);
+#ifndef BW_NO_DEBUG
+ for (size_t i = 0; i < n_channels; i++) {
+ BW_ASSERT_DEEP(bw_sampler_state_is_valid(coeffs, state[i]));
+ BW_ASSERT_DEEP(bw_has_only_finite(y[i], n_samples));
+ }
+#endif
+}
+
+static inline void bw_sampler_set_playback_rate(
+ bw_sampler_coeffs * BW_RESTRICT coeffs,
+ float value) {
+ BW_ASSERT(coeffs != BW_NULL);
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_init);
+ BW_ASSERT(bw_is_finite(value));
+ BW_ASSERT(value >= 0.f);
+
+ coeffs->playback_rate = value;
+
+ BW_ASSERT_DEEP(bw_sampler_coeffs_is_valid(coeffs));
+ BW_ASSERT_DEEP(coeffs->state >= bw_sampler_coeffs_state_init);
+}
+
+static inline char bw_sampler_coeffs_is_valid(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs) {
+ BW_ASSERT(coeffs != BW_NULL);
+
+#ifdef BW_DEBUG_DEEP
+ if (coeffs->hash != bw_hash_sdbm("bw_sampler_coeffs"))
+ return 0;
+ if (coeffs->state < bw_sampler_coeffs_state_init || coeffs->state > bw_sampler_coeffs_state_reset_coeffs)
+ return 0;
+#endif
+
+ if (!bw_is_finite(coeffs->playback_rate) || coeffs->playback_rate < 0.f)
+ return 0;
+
+ return 1;
+}
+
+static inline char bw_sampler_state_is_valid(
+ const bw_sampler_coeffs * BW_RESTRICT coeffs,
+ const bw_sampler_state * BW_RESTRICT state) {
+ BW_ASSERT(state != BW_NULL);
+
+#ifdef BW_DEBUG_DEEP
+ if (state->hash != bw_hash_sdbm("bw_sampler_state"))
+ return 0;
+
+ if (coeffs != BW_NULL && coeffs->reset_id != state->coeffs_reset_id)
+ return 0;
+#endif
+
+ (void)coeffs;
+
+ return bw_is_finite(state->pos) && pos >= 0.f;
+}
+
+#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
+}
+#endif
+
+#if !defined(BW_NO_CXX) && defined(__cplusplus)
+
+# ifndef BW_CXX_NO_ARRAY
+# include
+# endif
+
+namespace Brickworks {
+
+/*** Public C++ API ***/
+
+/*! api_cpp {{{
+ * ##### Brickworks::Sampler
+ * ```>>> */
+template
+class Sampler {
+public:
+ Sampler();
+
+ void setSampleRate(
+ float sampleRate);
+
+ void reset(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ float pos0 = 0.f,
+ float * BW_RESTRICT y0 = BW_NULL);
+
+# ifndef BW_CXX_NO_ARRAY
+ void reset(
+ std::array sample,
+ std::array sampleLength,
+ float pos0,
+ std::array * BW_RESTRICT y0);
+# endif
+
+ void reset(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ const float * pos0,
+ float * y0 = BW_NULL);
+
+# ifndef BW_CXX_NO_ARRAY
+ void reset(
+ std::array sample,
+ std::array sampleLength,
+ std::array pos0,
+ std::array * BW_RESTRICT y0 = BW_NULL);
+# endif
+
+ void process(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ float * const * y,
+ size_t nSamples);
+
+# ifndef BW_CXX_NO_ARRAY
+ void process(
+ std::array sample,
+ std::array sampleLength,
+ std::array y,
+ size_t nSamples);
+# endif
+
+ void setPlaybackRate(
+ float value);
+/*! <<<...
+ * }
+ * ```
+ * }}} */
+
+/*** Implementation ***/
+
+/* WARNING: This part of the file is not part of the public API. Its content may
+ * change at any time in future versions. Please, do not use it directly. */
+
+private:
+ bw_sampler_coeffs coeffs;
+ bw_sampler_state states[N_CHANNELS];
+ bw_sampler_state * BW_RESTRICT statesP[N_CHANNELS];
+};
+
+template
+inline Sampler::Sampler() {
+ bw_sampler_init(&coeffs);
+ for (size_t i = 0; i < N_CHANNELS; i++)
+ statesP[i] = states + i;
+}
+
+template
+inline void Sampler::setSampleRate(
+ float sampleRate) {
+ bw_sampler_set_sample_rate(&coeffs, sampleRate);
+}
+
+template
+inline void Sampler::reset(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ float pos0,
+ float * BW_RESTRICT y0) {
+ bw_sampler_reset_coeffs(&coeffs);
+ if (y0 != BW_NULL)
+ for (size_t i = 0; i < N_CHANNELS; i++)
+ y0[i] = bw_sampler_reset_state(&coeffs, states + i, sample[i], sampleLength[i], pos0);
+ else
+ for (size_t i = 0; i < N_CHANNELS; i++)
+ bw_sampler_reset_state(&coeffs, states + i, sample[i], sampleLength[i], pos0);
+}
+
+# ifndef BW_CXX_NO_ARRAY
+template
+inline void Sampler::reset(
+ std::array sample,
+ std::array sampleLength,
+ float pos0,
+ std::array * BW_RESTRICT y0) {
+ reset(sample.data(), sampleLength.data(), pos0, y0 != BW_NULL ? y0->data() : BW_NULL);
+}
+# endif
+
+template
+inline void Sampler::reset(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ const float * pos0,
+ float * y0) {
+ bw_sampler_reset_coeffs(&coeffs);
+ bw_sampler_reset_state_multi(&coeffs, statesP, sample, sampleLength, pos0, y0, N_CHANNELS);
+}
+
+# ifndef BW_CXX_NO_ARRAY
+template
+inline void Sampler::reset(
+ std::array sample,
+ std::array sampleLength,
+ std::array pos0,
+ std::array * BW_RESTRICT y0) {
+ reset(sample.data(), sampleLength.data(), pos0.data(), y0 != BW_NULL ? y0->data() : BW_NULL);
+}
+# endif
+
+template
+inline void Sampler::process(
+ const float * BW_RESTRICT const * BW_RESTRICT sample,
+ const size_t * BW_RESTRICT sampleLength,
+ float * const * y,
+ size_t nSamples) {
+ bw_sampler_process_multi(&coeffs, statesP, sample, sampleLength, y, N_CHANNELS, nSamples);
+}
+
+# ifndef BW_CXX_NO_ARRAY
+template
+inline void Sampler::process(
+ std::array sample,
+ std::array sampleLength,
+ std::array y,
+ size_t nSamples) {
+ process(sample.data(), sampleLength.data(), y.data(), nSamples);
+}
+# endif
+
+template
+inline void Sampler::setPlaybackRate(
+ float value) {
+ bw_sampler_set_playback_rate(&coeffs, value);
+}
+
+}
+#endif
+
+#endif